Can someone please check my answers for me for the following questions. THANK YOU!
1) An ion with an oxidation number of 3+ can combine with three other ions, if each of these ions has an oxidation number of....3-
2) The correct formula for nickel(II) chloride is...NiCl2
3) A compound composed of lithium and nitrate polyatomic ion is...LiNO3
4) How many forumla units are represented by 3K2SO3...my answer is 3
5) Which of the following is an organice compound?
a. H2SO4
b. C2H2
c. MgO
d. KNO3
I chose...B
You need to rethink 1. If an ion is 3+ and it combines with three other ions, then it will have the formula AX3; therefore, X would need to be something but not -3. (The TOTAL charge of X would be -3 but EACH would not be -3.
2 and 3 are ok.
3. Your answer of 3 would be correct if not for the coefficient of 3 in front of the K2SO3. EACH K2SO3 has 3 formula units but the coefficient multiplies everything by 3; therefore, there are 6 K and 3 SO3 for a total of 9.
5. B is correct.
1) To answer this question, we need to understand the concept of oxidation number. Oxidation number is a way to indicate the charge of an atom within a compound or ion. If an ion has an oxidation number of 3+, it means that it has lost three electrons and has a positive charge of 3.
In the given question, it states that this ion can combine with three other ions. If each of these ions has an oxidation number of 3-, it means that they have gained three electrons each and have a negative charge of 3.
So, the correct oxidation numbers for this scenario would be 3+ and 3-, which allows for the formation of a neutral compound or ion.
2) The correct formula for nickel (II) chloride can be determined by understanding the oxidation state of nickel and the charge of chloride. The Roman numeral (II) indicates that nickel has an oxidation state of 2+.
Chloride, on the other hand, has a charge of 1-. To form a neutral compound, the charges must balance. Since nickel has a charge of 2+ and chloride has a charge of 1-, we need two chloride ions to balance the charge of nickel.
Therefore, the correct formula for nickel (II) chloride is NiCl2.
3) To determine the compound composed of lithium and the nitrate polyatomic ion, we first need to know the formula and charges of each component.
The nitrate polyatomic ion is composed of one nitrogen atom (N) and three oxygen atoms (O), and it carries a charge of 1-. Lithium, on the other hand, carries a charge of 1+.
To form a neutral compound, the charges must balance. Since the nitrate ion has a charge of 1- and lithium has a charge of 1+, we only need one lithium ion to balance the charge of the nitrate ion.
Therefore, the compound composed of lithium and the nitrate polyatomic ion is LiNO3.
4) This question asks to determine the number of formula units represented by 3K2SO3.
To solve this, we need to understand the concept of a formula unit. A formula unit represents the smallest, discrete unit of a compound, and it is typically used for ionic compounds.
In the given compound, K2SO3, we have two potassium ions (K) and one sulfite ion (SO3). The coefficient of 3 in front of K2SO3 indicates that we have 3 units of K2SO3.
To calculate the number of formula units, we multiply the coefficient (3) by the number of units in one formula. In this case, there are 2 K ions and 1 SO3 ion in each formula unit.
Therefore, the number of formula units represented by 3K2SO3 is 3 x (2 + 1) = 9.
5) This question asks to identify the organic compound among the options provided.
Organic compounds are compounds that contain carbon and are typically associated with living organisms. In the given options, only option B, C2H2, contains carbon.
Therefore, option B, C2H2, is the organic compound among the given options (a. H2SO4, b. C2H2, c. MgO, d. KNO3).
1) An ion with an oxidation number of 3+ can combine with three other ions, if each of these ions has an oxidation number of...-1.
2) The correct formula for nickel(II) chloride is...NiCl2.
3) A compound composed of lithium and the nitrate polyatomic ion is...LiNO3.
4) How many formula units are represented by 3K2SO3? The correct answer is 9.
5) Which of the following is an organic compound? The correct answer is b) C2H2.